Sprint booster arrived and installed! I love it. Sport mode is definitely the way to go for daily driving. Very responsive. Since my original post, I've also got the RPi ram scoop installed (that alone I noticed a difference), K&N drop in and also removed my charcoal filter. Just these basic mods have made my 550i a fun car to drive! FYI, the control knob on the V2 of the sprint booster can be taken off after initial control setting. I don't like having that module making my cab look like a ricer (been there done that when I was younger). I don't recommend racing mode because there is some jerkiness to that. All in all, I think the sprint booster is worth every penny!
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